This is easy. An underground base on Mars' dark moon Phobos.
Easy.
English
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Turns out that is one of the strong holds for the elusive fifth race.
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Wait WHAT!? Man I barely even started on the blue prints and I've already been evicted. And yet, I am strangely happy. Link?
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Unfortunately, I have no idea if you have been evicted. When you said dark, the first thing I thought of was the dark army or the fifth race...